Natural sources include decomposition,ocean release and respiration.
Human sources come from activities like cement production, deforestation as well as the burning of fossil fuels like coal,oil and natural gas.
Answer:
<u>4</u>Cr + __302 -->_<u>2</u>Cr203.....
The answer is
Physical properties: Properties that do not change the chemical nature of matter
Chemical properties: Properties that do change tha chemical nature of matter
Examples of physical properties are: color, smell, freezing point, boiling point, melting point, infra-red spectrum, attraction (paramagnetic) or repulsion (diamagnetic) to magnets, opacity, viscosity and density. There are many more examples. Note that measuring each of these properties will not alter the basic nature of the substance.
Examples of chemical properties are: heat of combustion, reactivity with water, PH, and electromotive force.
Noun!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
65.712 grams of oxygen has reacted.
Explanation:
![2 C_2H_2(g) + 5 O_2(g)\rightarrow 4 CO_2(g) + 2 H_2O(g)](https://tex.z-dn.net/?f=2%20C_2H_2%28g%29%20%2B%205%20O_2%28g%29%5Crightarrow%204%20CO_2%28g%29%20%2B%202%20H_2O%28g%29)
Mass of acetylene = 21.39 g
Moles of acetylene = ![\frac{21.39 g}{26.04 g/mol}=0.8214 mol](https://tex.z-dn.net/?f=%5Cfrac%7B21.39%20g%7D%7B26.04%20g%2Fmol%7D%3D0.8214%20mol)
According to reaction , 2 moles of acetylene reacts with 5 moles of oxygen gas.
Then 0.8214 moles of oxygen gas will react with :
of oxygen gas.
Mass of 2.0535 moles of oxygen gas :
2.0535 mol × 32 g/mol = 65.712 g
65.712 grams of oxygen has reacted.